ci: use dollar syntax for echo

.github/workflows/publish.yml

@@ -29,13 +29,9 @@ jobs:
       with:
         python-version: 3.11
 
-    - name: Add qsv to PATH
-      run: |
-        ls -l
-        echo "$HOME/path_files" >> $GITHUB_PATH
-
     - name: Install dependencies
       run: |
+        echo "${HOME}/path_files" >> $GITHUB_PATH
         pip install -e ./bash_kernel
         pip install jupyter-book
         python -m bash_kernel.install

postBuild

@@ -1,4 +1,6 @@
 #!/bin/bash
 
+set -ex
+
 pip install -e ./bash_kernel
 python -m bash_kernel.install